package chapter10;

import java.sql.*;

public class Example01 {
    public static void main(String[] args) throws SQLException {
        Statement stmt = null;
        ResultSet resultSet = null;
        Connection conn = null;
        try {
            // 1. 注册数据库的驱动
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 2.通过DriverManager获取数据库连接
            String url =
                    "jdbc:mysql://localhost:3306/jdbc?characterEncoding=utf-8";
            String username = "java";
            String password = "java";
            conn = DriverManager.getConnection(url, username, password);

            // 3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();

            // 4.使用Statement执行SQL语句。
            String sql = "select * from users";
            resultSet = stmt.executeQuery(sql);

            // 5. 操作ResultSet结果集
            System.out.println("id	|	name	|	password|	email		|	birthday");
            while (resultSet.next()) {
                int id = resultSet.getInt("id"); // 通过列名获取指定字段的值
                String name = resultSet.getString("name");
                String psw = resultSet.getString("password");
                String email = resultSet.getString("email");
                Date birthday = resultSet.getDate("birthday");
                System.out.println(id + "	|	" + name + "	|	" + psw +
                        "	|	" + email + "	|	" + birthday);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            // 6.回收数据库资源
            if (resultSet != null) {
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
